JP2005352775A - Holder for object to be tested, and testing device provided therewith - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a holder capable of improving measurement accuracy of characteristics of an object to be tested, and capable of composing a comparatively simple testing device, and a testing device provided with the holder in regard to a testing device applying acceleration to an object to be tested to investigate its characteristics. <P>SOLUTION: The holder is adopted in the testing device carrying out testing in regard to the characteristics of the object to be tested relevant to at least one axis when a predetermined physical quantity is applied to the object to be tested outputting a signal relevant to the characteristics, and it has a plane formed at a predetermined relationship with respect to the at least one axis of the object to be tested, and a connection member connected to a transmitter of a receiver-transmitter converting the output signal of the object to be tested into an electric wave and transmitting the electric wave, and transmitting the signal to the transmitter. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a holder for a test object and a test apparatus including the same, and more particularly to a holder and a test apparatus suitable for investigating various characteristics of a test object by applying acceleration to the test object.

The background art of the present invention will be described by taking an acceleration sensor test as an example.
As an apparatus for testing acceleration sensors by adding acceleration with a centrifugal method, an acceleration sensor is attached to the outer periphery of a rotating body, and the rotating body is rotated on a horizontal plane to give centrifugal acceleration to the acceleration sensor. What is measured or tested is known.

  In such a test apparatus, there is a test apparatus disclosed in Patent Document 1, for example, for the purpose of improving the accuracy of centrifugal acceleration to be applied and reducing noise. In this test apparatus, the rotating body is rotated by a brushless motor to reduce the sliding noise of the motor brush. Further, by directly driving the rotating body without using a belt or a gear box and further using an air bearing to support the rotation of the rotating body, unnecessary vibrations are reduced from being transmitted to the rotating body. The brushless motor measures the rotation speed, compares the output signal of the encoder that encodes it, and the phase of the pulse of the reference pulse generator, and controls the speed to reach a predetermined rotation speed according to the phase difference. Yes. In order to make the signal transmission system less susceptible to noise, the output signal is transmitted in a contactless manner with a multiplexer, a controller, and the like arranged on the rotating body to convert the output signal of the acceleration sensor into a digital signal. And a rotary transformer that is an electrical rotary joint. A rotating transformer is also used to supply power from an external power source to a rotating multiplexer or controller.

On the other hand, as a holder for applying acceleration in each detection axis (X-axis, Y-axis, Z-axis) direction of the acceleration sensor, for example, there is one shown in Patent Document 2. This holder has a hexahedron, and the acceleration sensor is fixed so that each detection axis has a predetermined positional relationship with each surface, and each detection axis of the acceleration sensor matches the direction of acceleration to be applied. Thus, the measurement is performed while changing the direction by 90 °.
Patent No. 2913520 (paragraph number 0014) Japanese Patent Laid-Open No. 10-2914 (paragraph number 0003)

  However, in the test apparatus of Patent Document 1, a rotary transformer that transmits an output signal and electric power generates heat during rotation and heats the apparatus. As a result, for example, when the acceleration sensor has temperature dependence, there arises a problem that the reliability of the test is lowered. This problem can be solved by measuring the temperature of each acceleration sensor and correcting the output data, or by incorporating cooling means into the test device so as not to cause a temperature change, but the test device becomes complicated and expensive. Invite the problem. In addition, when the acceleration sensor is arranged in the test apparatus, it is necessary to align the acceleration sensor with the direction of the acceleration that provides the detection axis of the acceleration sensor. However, Patent Document 1 does not disclose this point.

  On the other hand, Patent Document 2 does not describe means for transmitting the output signal of the acceleration sensor.

  The present invention has been made in view of the above problems, and its purpose is to determine the characteristics of the DUT with respect to at least one axis when a predetermined physical quantity acts on the DUT to which a signal relating to the characteristics is output. By providing a holder that can improve the measurement accuracy of the characteristics of the object to be tested and that can be configured in a relatively simple manner, and a test apparatus that includes the holder, in the holder used in the test apparatus to be tested. is there.

  One embodiment of the present invention is the holder described above, wherein a plane formed in a predetermined positional relationship with respect to at least one axis of the device under test and an output signal of the device under test are converted into radio waves. And a connecting member that is connected to a transmitter of a transmitter / receiver that transmits the radio wave and transmits a signal to the transmitter. The holder is aligned using a plane formed in a predetermined positional relationship. Also, in order to collect the output signal of the device under test during rotation, the output signal of the device under test is transmitted to the transmitter by the connecting member to the transmitter of the holder, and transmitted wirelessly from the transmitter to the receiver. To do.

  The axis may be at least 2. When the detection axis of the DUT is 2, alignment can be easily performed by forming a plane of the holder so that the direction of acceleration applied to each detection axis can be aligned. it can.

  Furthermore, the said axis | shaft is 3 and may mutually orthogonally cross. When the detection axis of the DUT is 3, the positioning is accurately performed by forming a plane of the holder so that the direction of acceleration applied to each detection axis can be matched.

  In addition, it is desirable that the holder has a rectangular parallelepiped shape. When the detection axis of the test object is 3, two planes parallel to each axis are formed centering on the intersection of the detection axes of the test object, so that the alignment is accurately performed.

  In addition, the device under test may be an acceleration sensor. By making the device under test an acceleration sensor, the applied centrifugal acceleration is measured during the test.

  One embodiment of the present invention is a test apparatus that evaluates the characteristics of a device under test by adding centrifugal acceleration, and includes a rotating shaft, and the device under test is attached at a position eccentric from the axis of the rotating shaft. A rotating body, a holder having the above-described mode, a driving unit that rotates the rotating body, a transmitter that converts an output signal of the device under test into a radio wave, and a transmitter that is installed outside the rotating body and receives the radio wave A test apparatus. With this apparatus, various characteristics in a state where a predetermined acceleration is applied to at least one detection axis of the test object are measured using the holder according to any one of claims 1 to 5.

  According to the embodiment of the present invention described above, when testing the characteristics of the DUT with respect to one axis when a physical quantity is applied, the holder for holding the DUT has a predetermined positional relationship with the axis. Since it has a plane, the direction of the axis can be easily adjusted by the plane, and the signal output from the device under test is transmitted wirelessly. For example, a rotary transformer described in Patent Document 1 is used. As compared with the case of using, the heat generation is small, the influence of heat on the test apparatus can be suppressed, and the measurement environment of the device under test whose output is easily affected by temperature change can be maintained in a good state.

The present invention will be described based on the embodiments with reference to the drawings.
FIG. 1 is a perspective view for explaining a schematic configuration of an embodiment of a test apparatus according to the present invention. FIG. 2 is a cross-sectional view illustrating a state in which the test apparatus of FIG. FIG. 3 is a perspective view illustrating a schematic structure of the holder of FIG. FIG. 4 is a diagram for explaining cable routing in the holder of FIG. 3. FIG. 5 is a perspective view showing the back surface of the lower holder of the holder of FIG. FIG. 6 is a diagram for explaining a test method in the test apparatus of FIG. FIG. 7 is a diagram illustrating an example of a result of testing with the test apparatus of FIG.

  First, a test apparatus that applies a centrifugal acceleration to an acceleration sensor and tests its characteristics using a holder according to one embodiment of the present invention will be described with reference to FIG.

  The test apparatus 2 includes a rotating unit 22 that includes a rotating body 221 that rotates to generate centrifugal acceleration, a holding tool 1 that is attached to the rotating body 221 and holds an acceleration sensor, and an acceleration sensor that is mounted in the holding tool 1. A transmission unit 21 that amplifies the output signal of the signal and converts it to radio waves, a reception unit 23 that receives radio waves from the transmission unit 21, and a data processing unit that receives signals from the reception unit 23 and collects, organizes, and stores the data 24 and a controller 25 that gives an operation signal to the rotating unit 22.

  The rotating unit 22 includes a rotating body 221, a rotating shaft 223, a motor 224, a battery 225 as a power source, and a holder 226 that holds the battery 225. The motor 224 is connected to a rotating body 221 located above the rotating shaft 223. The holder 226 is disposed in the vicinity of the rotation center of the rotating unit 22 in order to suppress the acceleration applied to the holder 226 as much as possible and prevent the occurrence of vibration. When a plurality of batteries are required, they are arranged so that the centers of gravity of the plurality of batteries 225 are aligned with the axis of the rotating shaft 223. A holder 226 that holds the battery 225 is connected to the transmission unit 21 by electrical wiring. The holder 1 has a cubic shape, and an acceleration sensor is arranged so that the center of the acceleration sensor coincides with the center thereof, and holds the posture of the acceleration sensor.

  The holder 1 is accommodated in the mounting hole 222 of the rotating body 221. The mounting hole 222 is matched to the shape of the holder 1 so that the holder 1 does not move during rotation, and is as close as possible to the size of the holder 1. The mounting hole 222 has a cubic shape so that the holder 1 can be accommodated, and one of the central axes thereof coincides with the direction of acceleration to be applied, and centrifugal acceleration is added to the acceleration sensor held by the holder 1. In this way, it is arranged at a position eccentric with respect to the rotation center of the rotation shaft 223. As the motor 224, a brushless motor may be used to reduce sliding noise. The motor 224 includes an encoder for using the output signal for controlling the rotational speed of the motor.

  The transmission unit 21 includes a support member 211, a transmission board 212, and a socket 213. In order to prevent vibration, it is desirable to form an antenna for transmitting radio waves on the support member 211 by pattern printing. The support member 211 is formed with an electrical circuit for electrically connecting the socket 213 connecting the transmission board 212 and the holder 1 and the above-described holder 226. The transmitting unit 21 is arranged so that the center of gravity coincides with the rotation center of the rotating unit 22 in order to minimize the applied centrifugal force and suppress the occurrence of vibration.

  The receiving unit 23 installed away from the rotating body 221 includes an antenna 231, a receiving substrate 232, and a support member 233. The antenna 231 is installed as directly as possible above the transmission unit 21 in order to efficiently receive the radio wave transmitted from the transmission unit 21.

  The data processing unit 24 is connected to the receiving unit 23 and the controller 25 in order to obtain an output signal of the acceleration sensor and data on the number of rotations of the motor 224.

  As shown in FIG. 2, the holder 1, the transmission unit 21, the rotation unit 22, and the controller 25 are housed in the frame 3. If the transmitter 21 and the holder 226 are arranged vertically in the center of the rotating body 221 as shown in FIG. In this case, if the transmission unit 21 is arranged at the top, there is no obstacle between the transmission unit 21 and the antenna 231, so that radio wave reception sensitivity may be ensured.

  The rotating unit 22 is covered with a cover formed by, for example, the opening / closing door 31 and the chamber 32 in case the transmission substrate 212 of the transmitting unit 21 and its support member 211 are separated during rotation.

  In addition, when the rotating unit 22 and the transmitting unit 21 are arranged vertically as shown in FIG. 2, the heat generated by the motor 224 and the controller 25 is kept to avoid being transmitted to the upper acceleration sensor and the transmitting board 212. A chamber 32 may be provided around the tool 1 and the transmission board 212. Furthermore, it is better to ventilate the heat positively by providing a vent 34 and a fan so that the heat of the motor 224 and the controller 25 does not enter the frame 3.

  The controller 25 is housed in the electromagnetic shield box 33 or the like and disposed in the apparatus in order to avoid the influence of generated noise on the radio wave.

  The holder 1 will be described in further detail. As shown in FIG. 3, the holder 1 has an upper holder 11 and a lower holder 12. The acceleration sensor A is sandwiched between the holder 11 and the upper holder 11 and the lower holder 12 are fixed with bolts 14. Yes. The lower holder 12 has a wiring member 13 for transmitting the output signal of the acceleration sensor A.

  The upper mold 111 of the upper holder 11 has a fixing hole 112 that is a through hole that is counterbored so that the head of the bolt 14 does not protrude from the upper mold 111. In addition, even if the acceleration sensor A breaks during measurement, the upper holder 11 is provided with a recess according to the shape of the acceleration sensor A so that the pieces of the acceleration sensor A are not scattered in the test apparatus. Surrounded by 1. Further, the depth of the recess is slightly shallower than the height of the acceleration sensor A so that the acceleration sensor A does not move during rotation, and the acceleration sensor A is sandwiched between the upper holder 11 and the lower holder 12. .

  The lower mold 121 of the lower holder 12 has a screw hole 122 for fixing the bolt 14. When the material of the lower mold 121 is a low-strength material such as a resin, the screw hole 122 is easily hurt by attaching and detaching the bolt 14, so it is desirable to reinforce with a helicate or the like. It should be noted that if the upper holder 11 and the lower holder 12 are displaced, a step is formed and an accurate reference surface cannot be obtained. Therefore, the upper holder 11 and the lower holder 12 may be joined together.

  The wiring member 13 is for transmitting the output signal of the acceleration sensor A to a transmitter outside the holder 1, and has a connection terminal 131 connected to a terminal of the acceleration sensor A embedded in the lower mold 121, It comprises a connector 133 that connects to the transmitter and a cable 132 that connects each of them. The cable 132 was a shielded cable for noise suppression. The connector 133 is preferably a one-touch type so that the connection with the transmitter can be simplified.

  The holder 1 has a cubic shape in order to match the direction of three orthogonal detection axes of the acceleration sensor A with the direction of centrifugal acceleration while changing the posture by 90 °. The acceleration sensor A is arranged so that its center substantially coincides with the center of the holder 1. In other words, since each surface of the holder 1 is formed so as to be parallel to the three detection axes of the acceleration sensor A, the acceleration can be achieved simply by attaching the surfaces to the mounting hole 222 of the rotating body 221 while aligning the surfaces. The direction of the detection axis of the sensor A can be matched.

  The cable 132 of the wiring member 13 has a different shape when the posture of the holder 1 is changed for each axis to be tested. An example of this is shown in FIG. That is, the position of the connector 133 connected to the transmitter does not change, but when the posture of the holder 1 is changed, the cable 132 becomes like 132x, 132y, 132z for each axis. The length of the cable 132 is the longest 132z. For this reason, the length of the cable 132 is excessive depending on the posture of the holder 1, and centrifugal acceleration is also applied to the cable 132 during the test. The cable 132 must be fixed so that it does not move during the test. In the present embodiment, as shown in the figure, the cable groove 227 was cut around the mounting hole 222 for storing the holder 1 and the cable 132 was stored. Similarly, a cross-shaped groove as shown in FIG.

Next, a test example using the test apparatus will be described.
When testing the static characteristics of the acceleration sensor A, several stages of centrifugal acceleration to be applied to the electronic component were set in advance, and output signals of the electronic component at the set centrifugal acceleration were sequentially measured. For example, when examining the static characteristics when the centrifugal acceleration is 50G, 100G, 150G, 200G, 250G, and 300G, the number of rotations of the rotating body 22 corresponding to the centrifugal acceleration is set, as shown in FIG. The rotating body 22 was rotated while continuously changing the rotational speed. In this way, a desired centrifugal acceleration is applied to the acceleration sensor A.

  FIG. 7 shows the result of testing the static characteristics of the acceleration sensor A by the above test method. The horizontal axis of FIG. 7 is the average value of the portions (horizontal portions in the figure) where the centrifugal acceleration fluctuation calculated based on the output signal of the encoder is less than or equal to the specified value. The vertical axis represents the average value of the output signals from the acceleration sensor A.

  In addition, although the test apparatus according to the present embodiment is intended for a test object that outputs a signal such as an acceleration sensor, the test object as a target of the test apparatus according to the present invention is not limited thereto, For example, it is also possible to target machine parts for the purpose of durability testing. In addition, the number of axes whose characteristics are measured in the DUT may be at least one, and the shape of the holder is not limited to a cubic shape. In addition, the plane of the holder may be formed so as to have a predetermined positional relationship with an axis whose characteristics are measured in the DUT. In addition, the holder of the device under test and the transmitter may be provided with a communication function without being separated from each other.

It is a schematic block diagram of the testing apparatus of one embodiment of this invention. It is sectional drawing at the time of incorporating the testing apparatus of FIG. 1 in a flame | frame. It is a schematic block diagram of the holder of FIG. It is explanatory drawing of the cable management of the holder of FIG. FIG. 4 is a partial detail view of the holder of FIG. 3. It is a figure explaining the test method with the test device of FIG. It is a figure which shows an example of the test result in the testing apparatus of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Holder 11 Upper holder 111 Upper mold 112 Fixing hole 12 Lower holder 121 Lower mold 122 Screw hole 123 Cross groove 13 Wiring member 131 Connection terminal 132 Cable 133 Connector 14 Bolt 2 Test device 21 Transmitting part 211 Supporting member 212 Transmission board 213 Socket DESCRIPTION OF SYMBOLS 22 Rotating part 221 Rotating body 222 Mounting hole 223 Rotating shaft 224 Motor 225 Battery 226 Holder 227 Cable groove 23 Receiving part 231 Antenna 232 Reception board 233 Support member 24 Data processing part 25 Controller 31 Open / close door 32 Chamber 33 Magnetic shield box 34 Vent A Accelerometer

Claims (6)

  A holder for the device under test employed in a test apparatus for testing the properties of the device under test with respect to at least one axis when a predetermined physical quantity is applied to the device under test for which a signal related to the properties is output. A plane formed in a predetermined positional relationship with respect to the axis, and a connection for transmitting the signal to the transmitter by being connected to a transmitter of a transmitter / receiver that converts the signal into a radio wave and transmits the radio wave A holder having a member.   The holder according to claim 1, wherein the shaft is at least two.   The holder according to any one of claims 1 and 2, wherein the axis is 3, and the holders are orthogonal to each other.   The holder according to claim 3, wherein the holder is a rectangular parallelepiped.   The holder according to any one of claims 1 to 4, wherein the device under test is an acceleration sensor.   A test apparatus for evaluating characteristics of a device under test by adding centrifugal acceleration, comprising: a rotating body, the rotating body being attached at a position eccentric from the axis of the rotating shaft; and the rotating body A holder according to any one of claims 1 to 5, attached to the drive, a driving means for rotating the rotating body, a transmitter for converting an output signal of the device under test into a radio wave, and the rotation A test apparatus comprising a receiver installed outside the body and receiving the radio wave.

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